- A
VNet peering
Why wrong: VNet peering uses the Microsoft backbone; encryption is not automatically applied. While you can enable encryption in transit for peering, it is not the default and the question implies the need for encryption over the public internet, which is achieved by VPN gateways.
- B
Azure VPN Gateway (site-to-site connection)
Azure VPN Gateway creates an encrypted IPSec tunnel over the public internet, ensuring data is encrypted in transit between the two VNets.
- C
Azure ExpressRoute
Why wrong: ExpressRoute provides a private connection that does not traverse the public internet, but encryption is not inherent. Optional MACsec encryption can be added, but it is not a direct solution for internet-based encryption as described.
- D
Azure Firewall
Why wrong: Azure Firewall is a stateful firewall service used to inspect and filter traffic. It does not provide encrypted connectivity between VNets.
Quick Answer
The answer is Azure VPN Gateway with a site-to-site connection. This is the correct choice because it establishes an encrypted IPSec tunnel over the public internet between the two virtual networks, directly meeting the security mandate for encrypted inter-region VNet connectivity VPN traffic. IPSec provides confidentiality, integrity, and authentication at the network layer, ensuring that all data crossing regions is protected from eavesdropping or tampering. On the Microsoft Azure Security Engineer Associate AZ-500 exam, this scenario tests your understanding of when to choose VPN Gateway over alternatives like VNet peering, which is free but does not encrypt traffic over the public internet—a common trap. Remember that VNet peering is for private Microsoft backbone traffic, while VPN Gateway is your go-to for encrypted inter-region VNet connectivity VPN over the public internet. Memory tip: “Peering is private, VPN is encrypted over the public.”
AZ-500 Secure networking Practice Question
This AZ-500 practice question tests your understanding of secure networking. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company has two Azure virtual networks in different Azure regions that need to communicate with each other. The security policy mandates that all inter-region traffic must be encrypted over the public internet. Which connectivity solution should the company implement to meet this requirement?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Azure VPN Gateway (site-to-site connection)
Azure VPN Gateway with a site-to-site (S2S) connection is the correct solution because it establishes an encrypted IPSec tunnel over the public internet between the two virtual networks. This meets the security mandate for encryption of inter-region traffic traversing the public internet, as IPSec provides confidentiality, integrity, and authentication at the network layer.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
VNet peering
Why it's wrong here
VNet peering uses the Microsoft backbone; encryption is not automatically applied. While you can enable encryption in transit for peering, it is not the default and the question implies the need for encryption over the public internet, which is achieved by VPN gateways.
- ✓
Azure VPN Gateway (site-to-site connection)
- ✗
Azure ExpressRoute
Why it's wrong here
ExpressRoute provides a private connection that does not traverse the public internet, but encryption is not inherent. Optional MACsec encryption can be added, but it is not a direct solution for internet-based encryption as described.
- ✗
Azure Firewall
Why it's wrong here
Azure Firewall is a stateful firewall service used to inspect and filter traffic. It does not provide encrypted connectivity between VNets.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse VNet peering (which is private and free of charge within a region) as automatically encrypted, but it does not encrypt traffic over the public internet because it uses Azure's backbone; the question explicitly requires encryption over the public internet, which only a VPN gateway provides.
Detailed technical explanation
How to think about this question
Azure VPN Gateway uses IKEv2 (Internet Key Exchange version 2) with IPSec to establish secure tunnels, supporting protocols like ESP (Encapsulating Security Payload) in tunnel mode. The gateway can be deployed in active-active mode for high availability, and traffic is encapsulated with an outer IP header and encrypted using AES-256 by default. In a real-world scenario, this is commonly used for hub-and-spoke topologies where spokes in different regions need encrypted communication over the internet, with route-based VPNs using BGP for dynamic routing.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Secure networking — study guide chapter
Learn the concepts, then practise the questions
- →
Secure networking practice questions
Targeted practice on this topic area only
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All AZ-500 questions
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Microsoft Azure Security Engineer Associate AZ-500 study guide
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AZ-500 practice test guide
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FAQ
Questions learners often ask
What does this AZ-500 question test?
Secure networking — This question tests Secure networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure VPN Gateway (site-to-site connection) — Azure VPN Gateway with a site-to-site (S2S) connection is the correct solution because it establishes an encrypted IPSec tunnel over the public internet between the two virtual networks. This meets the security mandate for encryption of inter-region traffic traversing the public internet, as IPSec provides confidentiality, integrity, and authentication at the network layer.
What should I do if I get this AZ-500 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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